pluckyoudaoicibaDictYouDict[pluck 词源字典]
pluck: [OE] Pluck is a widespread Germanic word (Flemish has plokken, Swedish plocka, and Danish plukke, and German and Dutch the closely related pflücken and plukken), but it is ultimately of Latin origin. Prehistoric Germanic *plukkōn was acquired from a Vulgar Latin *piluccāre (source also of Old French peluchier ‘pluck’ – from which English gets plush [16] – and Italian piluccare ‘pluck’), a derivative of Latin pīlus ‘hair’ (source of English depilatory, pile ‘nap’, etc).

The use of the noun pluck for ‘courage’ originated in the 18th century from an earlier literal application to the ‘heart (and other internal organs) of a slaughtered animal’, which in turn was based on the notion of their being ‘plucked’ or removed from the carcase.
=> depilatory, pile, plush[pluck etymology, pluck origin, 英语词源]
pluck (n.)youdaoicibaDictYouDict
c. 1400, "act of plucking," from pluck (v.). Meaning "courage, boldness" (1785), originally in pugilism slang, is a figurative use from earlier meaning "heart, viscera" (1610s) as that which is "plucked" from slaughtered livestock. Perhaps influenced by figurative use of the verb in pluck up (one's courage, etc.), attested from c. 1300.
pluck (v.)youdaoicibaDictYouDict
late Old English ploccian, pluccian "pull off, cull," from West Germanic *plokken (cognates: Middle Low German plucken, Middle Dutch plocken, Dutch plukken, Flemish plokken, German pflücken), perhaps from Vulgar Latin *piluccare (source of Old French peluchier, late 12c.; Italian piluccare), a frequentative, ultimately from Latin pilare "pull out hair," from pilus "hair" (see pile (n.3)). But despite the similarities, OED finds difficulties with this and cites gaps in historical evidence. Related: Plucked; plucking.
To pluck a rose, an expression said to be used by women for going to the necessary house, which in the country usually stands in the garden. [F. Grose, "Classical Dictionary of the Vulgar Tongue," 1785]
This euphemistic use is attested from 1610s. To pluck up "summon up" is from c. 1300.